Inductor-dynamo.



Patented Oct. 19, 1909.

3 SHEETS-SHEET 2.

WITNESSES G. A. OOLMAN. INDUGTOR DYNAMO APPLICATION FILED DBO.31,190B. ggy g yg Patent'd; 0st. 19, 1909.

SSHBHTS-SHEET 3.

WITNESSES llVI/H/TOR ATTORNEYS GEORGE A. COLMAN, F SEATTLE, WASHINGTON.

INDUCTORFDYNAMO.

Specification of Letters Patent.

Patented Oct. 19, 1909.

- Application filed December 3.1, 1908. Serial No. 470,137.

To all whom it may concern:

Be it known that I, GEORGE A. COLMAN, a citizen of the United States, and a resident of Seattle, in the county of King and State of lVashington, have invented a new 'and Improved inductor-Dynamo, of which the following is a full, clear, and exact descrip-.

\ Y tion.

My invention relates to dynamos, my more particular purpose being to produce a dynamo of the inductor type having a minimum of Wearing parts and without brushes,

collectors or 'commutators.

My invention further relates to the construction of a high-speed rotorhaving generally the form of a smooth disk made entirely of solid metal, yet heterogeneous as to the magnetic properties.

My invention also oomprehends an arma- 1 ing the rotor upon a comparatively small elastic shaft so as to allow the rotor, when I turned at a high speed, to center itself independently of the position of the bearings,

which support said shaft.

My invention also relates ,to various improvements in dynamo construction for the pur ose of improving the eficiency of the mac nne.

Reference is to be had to the accompany ing drawings forming a part of this specification, in which similar characters of ref erenoe indicate corresponding parts in all the figures.

Figure 1 is a substantially central vertical section through my improved inductor dynamo, showing the relative positions of the rotor, the pole pieces upon opposite; sides of the same, the field windings for energizing the pole pieces and theshaft and bearings for supporting the rotor; Fig. 2 is a side elevation of the rotor; Fig, 3 is a side elevation of one of the pole pieces removed from the machine, this pole piece having a number of poles of like sign; Fig. 4 is a front elevation of one of the pole pieces and parts rigidly connected therewith; Fig. 5 is a diaram showing one form of wiring suitable %or my machine; Fig. 6 is a diagram indicondnctors, thus set- 20 are other sectors 21 of aluminum.

eating a slightly difierent form of wiring for one of the pole pieces.

At 7 8 are shown the two halves of a casing, these two halves being connected .to-

'gether by aid of flanges 9, l0 and screw bolts 11, so as to form a casing, as indicated in Fig. 1, this casing being provided with feet 12 whereby it is supported. Bolted upon opposite ends of the casing are spiders 1-3, and these spiders support bearings 14 by aid of webs 14 which are integral with the spiders. The bearings are covered by housings 15, also integral with the spiders from dust and also serve as oil boxes for lubricating the bearings and shaft. Ventilating holes are shown at 8.

At 16 is a very small shaft made pref- .13. These housings protect the bearings erably of spring steel or other metah-having a fair degreeof resilience combined with toughness. Oil rings 17 engage the shaft 16 and depend therefrom, for the purpose of distributing oil upon the shaft at points Fwhere-it engages the bearings. The shaft 16 is provided with an enlarged portion 18. shrunken upon this enlarged portion of the shaft is an armature member 19 made of soft steel and rovided with sectors 20 integral with it. isposed intermediate the sectors A band 22 of steel is shrunken upon the armaturemember l9 and the sectors 21, so as to form, together with these parts, a strong and compact wheel made entirely of metal. This wheel constitutes the rotor of my improved generator. It will be noted that this rotor is, as to the presence of metal, at every point merely a continuous disk, but as regardsits magnetic properties, it is heretogeneous, being to all intents and purposes a toothed wheel.

At 23, 24 are annular cores. which are connected rigidly with the casing by aid of screws 25, as will be understood from Fig. 1.

are provided with flanges 28, 29 to facilitate this purpose, and also-to increase the size of y the magnetic field.

These pole pieces are laminated, being built 28, 29 by aid Mounted upon the flanges are pole pieces 30, 31.

of dowel pins 28 nation for the pole pieces. when first con- 44 to 55, however, are

structed they are merely laminated annular disks. These are next turned, being thereby rendered concave so as to mate the outer surface of the rotor, as will be understood from Fig. 1'. The disks are next each provided with radial slots 32, 33, 34, 35, 36, 3'7, 37, 37 anddisposed intermediate these are other slots 38, 39, a0, 41, 42, 43, 43 43 Both pole pieces are exactly alike as regards their slots.

Windings suitable for a machine are shown in Fig. 5 and are numbered 44, 45, 4e, 47, 48, 4.9, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59. If desired, the windings just mentioned may be connected up in the order stated, or the connections may be changed as desired. For this purpose I provide connectors 59, 59", 59. It may sometimes be desirable to connect these windings in mul' tiple and at other times in series. The windings 59, 44, are connected with terminal wires 60, 60. The field windings 26, 27 are excited by a current generated extraneously for this purpose. The winding 56 is connected by a wire 61 and a connector 59" with the winding 55. A wire 62 and connector 59 connect the winding 51 with the winding 44. Similarly a wire 63 and connector 59 connect the winding 4-7 with the winding 48.

As is well known in this art, windings of every kind may be varied considerably intheir grouping and in the number of loops of wire used, and also in the size of the wire as well as in the manner in which the windings are connected relativel to each other. I do not limit myself, there'ore, to any particular arrangement of the windings relatively to the poles.

preferably mounted in the order of succession stated. For instance, the winding 44 shouldbe accommodated b the slots 32, 33; the winding 45 by the slots 34, 35; the winding 46 by the slots 36, 37, the winding 47 by the slots 37, 37 The corresponding windings48, 49, 50, 51 are made in the opposite side of the machine, after' which the windings 52, 53, 54, are made upon the same side of the machine as the windings 44, 45, 46, 47,'but in different groups of slots, the four windings last mentioned overlapping the other four windings of the same disk, as will be understood from Fig. 5. Again, if it be desired to produce a single-phase machine, the number of slots is increased and the windings 6-1, 65, (36, 67

are arranged so as to overlap, as indicated in 6, these windings being separated by, loops 68', 69, 70. Terminal Wires are shown at 71, 72. The faces 73, 7a constitute the poles of the machine. There may very con veniently be sixteen poles upon each side of the rotor. The magnetic lines extend directly across from each pole.to the corresponding pole opposite the rotor. The tinning of the rotor carries with it the magnetic lines, and as these are carried around they cut the windings, setting up alternating currents.

The dynamo complete contains no brushes, and the only wearing parts about it are the two bearings where engaged by the shaft. As the rotor turns at a very high rate of speed and is neatly balanced, there is little or no vibration. The flexibility and elasticity of the shaft allow the rotor to center itself independently of the supports for the shaft, and also tends to lessen the amount of vibration.

It will be noted that the rotor is, for purposes of convenience in construction, virtually a solid metallic wheel or disk. Yet, for purposes of producing currents in the mat- The various windings ter above described, it is, to all intents and purposes, a toothed whee I find that the machine operates well 'in practice. Thfe is little or no heating in the armature, this being due to the fact that the armature revolves in a perfectly uniform field and-cuts no ma netic lines. In other words, the cutting o the lines of force is such that no eddy currents are set up in the armature.

The operation of my device is as follows: The parts being assembled as above indicated, and'the machine being excited by aid of a storage battery (not shown) .power is applied to the shaft 16, so that the rotor is turned rapidly. Preferably the dynamo is connected directly to a steam turbine of the impact type, and may be run at 14,000 revolutions per minute. The machine develops a very large current of high frequency.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

' 1. A rotor comprising a revoluble member of magnetic material provided with sectors integral with it, a plurality of sectors of nonma netic material disposed intermediate sai first-mentioned sectors, and a metallic band encirclin all of said sectors for the urpose of'ho ding the same together and orming therewith a solid wheel.

2. In a generator, the combination of field magnets and a rotor disposed adjacent there to, said rotor consisting of a disk, thick at its middle ortion and thin at its edges, portions of said disk being magnetic and other portions of said disk being non-magnetic.

3. The combination of field magnets arranged in pairs and mating each other, said no and nmg and 1'01; 1 disposed intermediate said. maglniving generally the form of a disk,

being thinner so; its outer edges points ndyiccnt to its middle, and

than at having portions of its surface subsianfiial-ly parallel with saidinclinod faces, sgiid disk being of magnetic material and. provided. with masses non-magnetic material lending anti "y through 4. in an induction generator, the; combination of slxi-ionary field magnet with laminated annulmconcave faced pole pieces, facin each other, the polo pieces radially slotted, to receive the altcrnaiing curnei's ding;- piovidod wil inclined faces, l rent conductors,

and a rotor disposed l11l19'- mediate said pole pieces and having 'the general form of a disk, being thinner at its outer edge, than at its middle, and having its surface parallel With said concave pole pieces said disk being of ma -netic material and provided with masses 0? non-magnetic material extending entirely through it,

in testimony whereof I have signed. my name to this specification in the presence of two subscribing Witnesses. GEORGE A. COLMAN.

Witnesses "WILLIAM H. BEA'ETY, LAWBENGE J. OOLMAN. 

